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Bought this lens after long consideration and after testing a used non OS version. Very pleasent surprise after testing on birds and wildlife.

Have a supersharp Canon 100-400 but need more reach and better F plus full AF which is imposible witch Canon and a TC (unless you go for 1D). It possible to reach 600 mm and with my 7D it equals 960 mm. With the very good 3 step OS and full AF i have managed BIF shots impossible with the Canonlens.

It is heavy, 3 kg so i prefer my Canon 100-400 when mobile.
When i want bokeh and supersharp photos i use my Sigma.
Due to better OS and 2.8 you have a 3-4 steps advantage over the Canonlens.

All in all higly recommended for people who wants a versatile lens ( 120-300 F2,8 or 160-420 F 4,0). You get very good pics even with 600 mm F 9,0.